*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
19942
19951
19961
19970
19980
19990
20000
20010
20020
20031
20040
20050
20060
20072
20081
20090
20104
201114
20122
20132
20148
201516
201612
201733
20186
20191
20201
20212
20226
20234
20242
Total121