*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19781
19791
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19903
19915
19921
19935
19941
19951
19960
19971
19986
19990
20000
20010
20020
20032
20041
20050
20062
20072
20085
20096
20101
20111
20121
201310
20146
201517
20163
20174
20184
20193
20202
20212
20224
20230
20241
Total104