*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
19932
19943
19959
19961
19973
19980
19992
20000
20016
20020
20031
20040
20050
20060
20070
20085
20090
201037
201137
20128
20137
20146
20150
20161
20170
Total130