*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19832
19841
19850
19861
19875
19880
19890
19900
19910
19920
19931
19940
19951
19960
19972
19981
199937
20000
20012
20020
20030
20040
20050
20060
20070
20080
20090
20101
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
Total57