*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19843
19850
19863
19870
198814
19896
19902
19913
199216
199329
199432
199511
19962
19972
19989
19990
20000
20011
20028
20038
20047
20057
20061
20070
20086
20091
20100
20110
20121
20130
20140
20150
20160
20170
Total175