*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19892
19901
19910
19922
19930
19942
19951
19960
19970
19980
19990
20000
20010
20020
20032
20043
20053
20065
20072
20083
20095
20104
20112
20124
20133
201412
20151
20167
20173
20180
Total67