*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
19892
19901
19910
19923
19937
19940
19950
19960
19971
19980
199936
200028
200132
20020
20030
20044
20050
20060
20070
20083
20095
20100
20111
20120
20130
20140
201512
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total135