*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
199012
19918
199213
19931
19947
19954
19967
19972
19984
19992
20004
20016
20026
200319
200410
200511
20061
20075
200810
20092
20102
20115
201211
20130
20140
20150
20160
20170
Total152