Patstat CPCs counts by patent office

Recently I had to try to understand how good is the coverage of patstat in terms of CPCs for some of the most relevant application authorities.
Obviously there is no benchmark data available, thus the main concept I used was a comparison of average number of Cpcs by application authority/year in order to display whether the baseline had some discontinuities.
I also dropped data where the number of applications was below 10k.

I display the results below.
A couple of short comments:
1) only few authorities seem to have discontinuities int their average number of CPCs: AT, BR and IT somehow.
2) average number of CPCs can differ much among patent offices (see FI values above 2 for MX, FR versus an average 0.2 for JP and 0.5 for CN); this seems to indicate difference in examination process, but values below 1 also indicate possible errors in data.

year	AT	AU	BR	CA	CN	DE	EP	ES	FR	GB	IT	JP	KR	MX	RU	SU	TW	UA	US
1990	1,5805	1,0222	1,2443	1,4408	0,319	0,6848	1,1223	1,5077	1,8886	0,9416	0,8238	0,1386	0,7823			0,115			0,7347
1991	1,8534	1,0777	1,2416	1,5371	0,2501	0,7081	1,1752	1,5672	1,9282	0,9396	0,7817	0,1468	0,6869			0,1497			0,7179
1992	2,0021	1,2314		1,634	0,2463	0,7133	1,1792	1,6628	1,968	0,9351	0,8025	0,1558	0,6441			0,1708			0,7021
1993	2,0424	1,2887	1,5505	1,7356	0,3428	0,7074	1,1998	1,7068	1,986	0,9856	0,8661	0,168	0,559		0,419				0,6926
1994	1,9649	1,0341	1,6268	1,6973	0,5032	0,6946	1,1794	1,7314	1,9676	0,9847	0,8669	0,2014	0,4896		0,5025				0,6595
1995	1,9811	1,0222	1,543	1,6666	0,5663	0,6806	1,1286	1,7256	1,9316	0,9925	0,8117	0,2011	0,4196		0,5805				0,5947
1996	1,9141	0,9888	1,5517	1,5929	0,5651	0,6548	1,0688	1,6665	1,876	0,9942	0,8342	0,2022	0,4373		0,5507				0,598
1997	1,9004	0,9449	1,4826	1,5193	0,5625	0,6324	0,9858	1,667	1,8377	0,9898	0,8288	0,2012	0,4574		0,584				0,5325
1998	1,8352	0,897	1,5285	1,4542	0,5681	0,6172	0,9136	1,6449	1,8431	0,9694	0,8305	0,1996	0,4092		0,568		1,0407		0,511
1999	1,7457	0,8469	1,455	1,4137	0,5214	0,6146	0,8547	1,6162	1,8554	0,9476	0,9134	0,2036	0,3617		0,5118		0,7697		0,461
2000	1,6225	0,7958	1,4826	1,3732	0,4663	0,6169	0,7965	1,6489	1,8563	0,9262	0,9536	0,1978	0,3027		0,5013		0,7841		0,3945
2001	1,656	0,7811	1,5078	1,3952	0,4516	0,6452	0,7667	1,6923	1,8714	0,9591	1,018	0,2014	0,3956		0,4893		0,7597		0,353
2002	1,7174	1,1174	1,5313	1,4065	0,4049	0,6962	0,7802	1,744	1,9083	0,9843	1,0718	0,2096	0,4178	2,2191	0,4933		0,7513		0,3497
2003	1,7458	0,8989	1,5068	1,4185	0,3647	0,736	0,7664	1,7436	1,9423	1,0343	1,0689	0,2152	0,3862	2,2894	0,514		0,5934	0,3853	0,3419
2004	1,7494	1,378	1,448	1,4239	0,3348	0,85	0,7282	1,7534	1,8975	1,1297	1,0841	0,2112	0,3122	2,2233	0,5591		0,537		0,3124
2005	1,7678	1,3685	1,4751	1,3627	0,2924	0,8675	0,6956	1,7406	1,9154	1,2638	1,1522	0,2116	0,3297	2,1751	0,6032		0,5286		0,2911
2006	1,8316	1,3601	1,4945	1,3074	0,2581	0,911	0,6806	1,8097	1,9235	1,3325	1,0348	0,2236	0,3352	2,3045	0,6156		0,5412	0,3992	0,2881
2007	2,0192	1,3467	1,475	1,287	0,2306	0,9558	0,6755	1,8217	1,9513	1,3541	1,0811	0,2324	0,3822	2,0726	0,6335		0,5729	0,3067	0,2803
2008	2,2159	1,4345	0,8578	1,3487	0,1984	0,9881	0,6757	1,8483	1,9885	1,3961	1,4127	0,2364	0,4006		0,6282		0,5591	0,2352	0,2864
2009	2,5456	1,4981		1,412	0,1637	1,0438	0,7061	1,8853	2,0335	1,3971	1,7341	0,2607	0,3819	2,0523	0,6939		0,5626	0,132	0,3034
2010		1,5006		1,4812	0,1395	1,0705	0,6947	1,8731	2,1195	1,449	1,8386	0,2692	0,388	2,1157	0,6558		0,5983	0,0535	0,2955
2011		1,4532		1,4864	0,1106	1,0637	0,6948	1,6421	2,1896	1,5088	1,8135	0,277	0,3975	2,1235	0,4225		0,5993	0,0403	0,2861
2012		1,2387		1,3143	0,0804	1,0109	0,6665		2,1202	1,4576	1,8017	0,2395	0,3442	2,0942	0,2363		0,5584	0,0367	0,2684
2013		0,5364		0,746	0,0437	0,7309	0,895		1,1866	0,7998		0,2894	0,2791	2,1296	0,0695		0,4253		0,2985