*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19860
19870
19880
19890
19900
19913
19923
19931
19940
199519
199619
19971
19980
19993
20000
20010
20022
20030
20040
20050
20060
20070
20080
20090
20100
20110
20121
20130
20140
20151
20160
20170
20181
20190
20200
20210
20225
20230
Total60