*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19750
19765
19775
19781
19791
19801
19815
19820
19831
19841
19851
19863
19870
19882
19892
199030
19910
19923
19930
19940
19951
19960
19970
19980
19992
20001
200110
20024
200314
200439
20053
20063
20071
20087
20097
201036
201138
20121
201313
20142
20150
20164
20173
201819
201963
20200
Total333