*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
19909
19913
19920
19930
19945
19950
19960
19974
19980
19991
20000
20010
20020
20030
20040
20051
20060
20070
20083
20092
20107
20113
20123
20130
20143
20152
20162
20170
201826
20190
Total74