*Excludes Observations that spanned multiple years

Pre 19701
19700
19712
19720
19730
19741
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19851
19861
19870
19880
19896
199023
199115
19929
199311
199412
199514
199625
199729
19980
19994
20002
20016
20027
20032
20048
20056
20061
20071
20081
20092
20100
20110
201254
20130
20140
20150
20161
20170
Total246