*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19720
19730
19740
19750
19760
19770
19783
19790
19800
19810
19822
19831
19840
19851
19860
19870
19884
19892
199013
19913
199212
199320
19949
19957
19963
199711
19985
19991
20002
20014
20021
20030
20041
20055
200611
20074
20080
20097
20102
20111
20121
20130
20140
20150
20160
20170
Total143