*Excludes Observations that spanned multiple years

Pre 197010
19701
19711
19721
19731
19740
19750
19761
19770
19781
19792
19806
19811
19821
19839
19842
19854
198663
198743
198827
198937
199063
1991128
199265
1993140
199471
1995111
199655
1997101
199888
199938
200052
200157
200240
200311
200480
200594
200620
200721
200836
200918
201020
201124
20120
20135
20148
20155
201620
20178
20180
Total1590