*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
197238
197313
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19851
198613
198714
198819
198915
199014
199125
199226
199311
19940
199511
19960
199725
19984
199916
20008
20011
20027
20030
20042
200510
20063
20072
20084
20096
20100
20111
20121
20130
20140
20150
20161
20170
20180
Total293