*Excludes Observations that spanned multiple years

Pre 197022
19701
19712
19720
19732
19741
19754
19761
19770
19780
19791
19801
19812
19820
19830
19840
19854
198614
19871
19882
19895
19902
199111
199216
19933
19943
19955
19961
199712
199835
199914
2000873
2001198
2002151
2003193
2004416
2005264
2006169
200789
2008222
2009396
2010459
2011979
2012641
2013275
20141040
2015690
20161237
2017265
201878
201930
20208
20211
Total8839