*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19833
19840
19850
19861
19870
19887
19890
199010
19910
19922
19933
19942
19951
19960
199711
19982
19990
20000
20010
20022
20030
20043
20050
20060
20070
20081
20090
20103
20116
20120
20130
20140
20150
20161
20170
Total59