*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19794
19800
19810
19820
19830
19840
19850
19862
19877
19884
19890
19901
19910
19921
199312
19945
19952
19962
19971
19980
19991
20001
20015
20024
20030
20040
20050
20060
20070
200810
20090
201045
201149
20120
20130
20141
20150
20161
20170
Total158