*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19863
19870
19880
19890
19900
19910
19920
19930
19945
19952
19961
19970
19980
19990
20000
20012
20020
20032
20040
20050
20060
20070
20080
20090
20100
20110
20120
20133
20141
20150
20160
20170
20181
20190
20200
20210
20220
Total22