*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19752
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19903
19913
19925
19930
19944
19952
19966
19973
19980
19997
200012
20013
20024
20036
20044
20051
20060
20075
20086
20093
20101
20112
20120
20130
20140
20150
20160
20170
Total82