*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
198818
19890
199010
19913
19924
19932
19941
19951
19961
19970
19980
19992
20004
20011
20020
20030
20040
20050
20060
20070
20087
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20205
20211
20222
20233
20241
Total68