*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19853
19861
19872
198812
19891
19900
199130
19925
199324
19940
199510
19967
19978
19981
19992
20000
20011
20021
20030
20040
20050
20060
20070
20084
20090
20100
20110
20120
20131
20140
20150
20161
20170
20180
20190
20200
20210
20220
Total116