*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19911
19921
19930
19940
19950
19960
19971
19980
19990
20000
20015
20022
20037
200423
200517
20065
20075
20089
20092
20102
20110
20126
20130
20140
20150
20160
20170
Total86