*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
19902
19910
19920
19930
19940
19955
19960
19971
19980
19990
20000
20017
20020
20032
20044
20059
20061
20070
20081
20091
20100
20111
20124
20131
20140
20150
20160
20170
20180
20190
20200
20210
20220
Total39