*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19873
19880
198912
199013
199118
199223
199333
199425
199567
199610
199735
199824
199910
200010
20015
20029
20032
200425
20059
20060
20073
20081
20091
20105
201114
20120
20130
20142
20150
20166
20170
Total367