*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19834
19840
19850
19861
19875
198827
19890
19905
19913
19929
19930
19946
19956
19965
19972
19985
19990
20001
20010
20020
20033
20043
20051
20063
20070
20082
20091
20107
20114
201217
201321
20144
20151
20166
20170
20182
20190
20200
20211
20220
Total156