*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
19900
19910
19924
19930
19940
19950
19961
19972
19982
19992
20001
20017
20022
20038
20047
20052
200617
200712
200826
20099
201014
20112
20123
20132
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total123