*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
19922
19935
19940
19950
19960
19971
19980
19994
20002
20017
20020
20030
20040
20050
20062
20070
20080
20090
20106
20113
20122
20132
20140
20150
20161
20170
20183
20194
20200
20211
20222
20233
20241
Total51