*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197214
19733
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
198415
19857
198628
19879
198839
198927
199022
199178
199232
19933
19948
19955
19963
19973
199810
199929
200070
200124
200210
20031
20042
20053
20063
20073
20080
20093
20103
20114
20124
20136
20146
20156
201618
20178
20180
Total509