*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19755
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19911
19921
19931
19940
19950
19961
19971
19983
19994
20002
20010
20020
20032
20046
20052
20060
20070
20084
20093
20100
20116
20123
201312
20140
20150
20160
20170
Total58