*Excludes Observations that spanned multiple years

Pre 197070
19700
19711
19720
19731
19741
19752
19761
19772
19780
19791
19800
19811
19821
19832
19840
19851
19869
19874
19888
19894
19903
19918
19928
19935
19944
19954
19967
199712
19983
199923
2000130
2001226
200261
2003280
2004200
2005288
2006152
2007182
2008321
2009469
2010245
20111122
2012689
20131140
20141091
20151078
2016392
2017147
201863
201926
202016
20210
Total8504