*Excludes Observations that spanned multiple years

Pre 1970137
19705
19711
19721
19733
19740
19754
19760
19771
19786
19790
19801
19810
19820
19830
19840
198512
19861
19870
19880
19890
19900
19910
19921
19930
19942
19950
19960
19974
19983
19995
20000
20010
20022
20030
20040
20050
200625
20070
20083
200918
201016
20110
20124
201346
20141
20156
20160
20170
Total308