*Excludes Observations that spanned multiple years

Pre 19700
19700
19714
19726
19738
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19844
19852
19867
19871
198810
19890
19904
19918
19920
19931
19940
19950
19960
19971
19983
19993
20004
20010
20022
20033
20044
20051
20063
20073
20082
20095
20107
20114
20124
20135
20144
20153
20165
20173
20180
Total124