*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19802
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
199215
19939
19944
19950
19961
199741
19982
19990
20000
200133
20020
200331
20041
20050
20060
20070
20081
20090
20102
20110
20122
201311
201410
20152
201616
201725
201847
201974
202014
20210
20222
Total347