*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
19872
19885
19890
199016
19916
19922
19934
19943
19959
19961
19973
19980
19992
20000
20016
20020
20031
20040
20050
20060
20071
20085
20090
201037
201142
20128
20137
20146
20152
20161
20171
20181
20190
Total171