*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
198733
19881
19893
19900
19916
19921
19931
19941
19950
19960
19971
19982
199920
20004
20011
20020
20030
20040
20050
20060
20072
20081
20092
20100
20110
20120
20132
20140
20150
20160
20171
20180
20190
20200
20210
20220
Total83