*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19750
19763
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19915
19920
19930
19942
19954
199614
19971
19981
19990
20000
20010
20020
20030
20042
20052
20061
20070
200814
200915
201022
20117
20125
201311
201413
201513
20165
20170
20180
20190
20200
20210
20220
20230
20240
Total141