*Excludes Observations that spanned multiple years

Pre 197028
19700
19711
19721
19730
19740
19752
19760
19772
19780
19790
19800
19812
19822
19830
19843
19850
19860
19870
19881
19890
19903
19912
19920
19930
19947
19952
19960
19971
19980
19990
20001
20010
20020
20030
20040
20051
200613
20077
20082
20091
20100
20112
20121
20130
20140
20150
20160
20171
20181
20193
20205
20215
20221
20232
20246
Total109