*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
19882
19890
199015
199119
19926
19938
199412
199515
199611
199718
19983
19995
20007
20013
20029
20035
20040
20052
20061
20071
20080
20090
20100
20110
201254
20130
20140
20150
20161
20170
Total197