*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
19953
19960
19970
19986
19990
20000
20010
20020
20033
20040
20050
200610
20078
20084
200917
20105
201111
20126
20134
201415
20154
20167
20179
20186
201914
20200
202110
20222
20230
20240
Total144