*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19899
19900
19911
19920
19930
19940
19950
19960
19970
19980
19990
20000
200126
20025
20030
20040
20051
20063
20072
20082
20093
201024
20112
20122
20132
201418
20152
20163
20171
20180
Total107