*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20052
20063
20070
20081
20092
20100
20110
20124
201311
20142
20151
20161
201717
20187
20192
20204
20218
20228
20233
20240
Total76