*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197211
19737
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
198622
19876
198810
19892
19905
199127
19928
19930
19942
19954
19962
19972
19980
199920
200025
200115
20021
20030
20040
20050
20063
20071
20088
20091
20105
20116
20123
20132
20149
20153
20165
20170
20180
Total215