*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19757
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19924
19930
19940
19950
19960
19971
19984
19997
20005
20013
20020
20031
20043
200510
20060
20070
20082
20090
20100
20116
20122
201312
20140
20150
20160
20170
Total67