*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
19911
19925
19930
19940
19950
19961
19972
19982
19990
20000
20016
20021
20039
200410
20055
200620
200716
200837
200911
201013
20112
20126
20132
20140
20151
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total152