Counting patstat patents by application year

Here below a small table created by counting by application year patents applied @ EPO vs patents applied @ USPTO. Data have been counted from september 2009 data, starting from 1980.
Note that the peak is in 2004 for US and 2006 for EPO due to the examination lag (for both office) and also to the delay in including Us patents in patstat, for USPTO.
Nota also that 2001 sudden rise of 100% of patent count for USPTO is due to a change in the US Patent Law, since US Patent and Trademark Office was obliged to publish patent applications from 29 November 2000. However USPTO internal publishing system meant that publication actually began in March 2001.

appl year	EPO pat#	USPTO pat#
1980	19724	67106
1981	24959	64458
1982	28522	65614
1983	31609	62165
1984	36952	67690
1985	39375	72161
1986	43083	75925
1987	45817	82387
1988	52186	91028
1989	57727	97146
1990	63907	100332
1991	59280	101194
1992	60626	104798
1993	60066	109216
1994	62005	124374
1995	65308	145762
1996	71413	146351
1997	80488	172249
1998	90974	175349
1999	98718	193052
2000	109395	229731
2001	115110	428829
2002	112839	443539
2003	115652	458809
2004	120813	490649
2005	126739	488568
2006	129292	404225
2007	112413	328202
2008	35728	183275
2009	2909	13271

Here below a graph showing the differences...