*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
197512
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19902
19912
19926
19930
199413
19952
19966
19973
19987
19992
20000
200117
200211
20030
200435
20057
20065
20074
20083
200955
201020
201110
20128
201314
20141
20150
20160
20170
20180
Total245