*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19923
19934
19943
19950
19960
19976
19980
19991
20000
20017
20020
20031
20040
20054
20062
20070
20081
20090
201026
201110
20122
201320
201412
20155
201611
201717
201822
201916
20200
20210
20220
Total176