*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19751
19761
19770
19780
19790
19800
19811
19820
19832
19840
19851
198619
19870
198824
198939
19900
19916
19924
19930
19940
19957
19965
199723
19980
199940
200015
20011
20024
20030
20040
20050
20060
20070
20084
20090
20104
20110
20120
20130
20140
20150
20160
20170
Total203