*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19782
19790
19800
19810
19820
19831
19840
19850
19860
19870
198815
19893
19905
19918
19929
199315
19941
19953
19964
19972
19987
19995
20003
20012
20020
20036
20040
20054
20061
20072
20088
20095
20102
20114
20121
20132
20144
20151
20167
20171
20180
Total134