*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19811
19820
19830
19841
19851
19861
19870
19881
19890
19900
19910
19920
19930
19940
19952
19960
19970
19980
19990
20000
20011
20020
20031
20040
20050
20061
20070
20081
20090
20100
20110
20120
20130
20140
20151
20160
20170
20180
20190
20200
20210
20221
20231
20241
Total20