*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
19901
19912
19920
19930
19946
19950
19963
19973
19982
19992
20000
20010
20020
20030
20040
20050
20060
20070
20080
20097
20103
201117
201216
201311
201411
20156
20167
20170
20180
20190
20200
20210
20220
20230
20240
Total97