*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19800
19810
19820
19830
19841
19851
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20003
20010
20020
20030
20040
20050
20060
20070
20080
20090
20101
20110
20120
201338
20141
201516
20161
20171
20180
Total67