*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19792
19800
19811
19820
19830
19841
19850
19860
19870
19880
19890
19902
19914
19923
19933
199413
199510
19961
19970
19980
19998
20002
200125
20025
200318
200433
20050
20062
20070
20088
20096
201029
201127
20122
20137
20142
20151
20163
20172
201817
201915
20200
20210
20220
Total253