*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197220
197331
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
198415
19850
19860
198743
198821
198921
19908
199127
199257
19935
19947
19955
19962
19970
19980
199931
200034
200115
20021
20031
20040
20050
20064
20071
20088
20090
20102
20115
20120
20130
20140
20153
20162
20172
20180
Total372