*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
19915
19924
19931
19940
19950
19960
19971
19980
19992
20005
20018
20025
20038
20045
20054
20062
20073
20083
20093
20104
20111
20121
20130
20140
20150
20160
20170
Total70