*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19862
19870
19880
19890
19900
19910
19926
19930
19940
19951
19963
19970
19980
19990
20000
20010
20020
20030
20040
20050
20061
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total16