*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19758
197610
19770
197820
19790
19800
19815
19821
198310
198413
19856
198614
198714
19887
198910
19908
19912
19924
19936
199422
199561
1996146
1997172
1998190
1999464
2000353
200182
200290
2003209
2004205
2005207
2006315
2007349
2008135
2009248
2010231
2011181
201248
201360
201433
20150
20160
20170
Total3940