*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19791
19800
19810
19820
19830
19840
19852
19860
19870
19880
19891
19903
19918
19926
19938
19942
199511
19966
19970
19980
199910
200012
20013
20021
20030
20041
20051
20061
20070
20083
20092
20104
20119
20121
20133
20140
20151
20164
20178
20180
20190
20200
Total113