*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19750
19760
19770
19781
19791
19801
19810
19823
19832
19841
19855
19863
19873
19882
19893
199015
199128
19926
19936
19944
19954
19966
19972
19980
19992
20001
20014
20020
20035
20040
20050
20063
20071
20082
20090
201068
201164
20120
201319
201411
201545
201637
201739
201875
201930
20200
Total503