*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19842
19850
19860
19870
19880
19890
19900
19910
19920
19931
19940
19950
19960
19970
19981
19991
20000
20010
20020
20031
20040
20050
20061
20070
20081
20090
20101
20110
20120
20132
20141
20150
20160
20170
20181
20191
20200
20210
20220
20230
20240
Total16