*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19860
19872
19886
19892
19900
19911
19921
19931
19941
199512
19963
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20071
20080
20090
20100
20111
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
Total38