*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19731
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19873
198814
19895
199010
199128
199252
199357
19949
199528
19960
19970
19980
19990
20000
20011
20022
20030
200430
20052
20063
200714
20087
20092
20101
20110
20120
20130
20141
20150
20163
20171
20183
20191
20200
20211
Total283