*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
197210
197312
19740
19750
19760
197713
19780
19790
19800
19810
19820
19830
19842
19850
198611
19870
19880
19893
19900
199112
19921
19932
199415
19951
19960
19970
19980
19990
20000
20010
20020
20030
20040
20051
20060
20071
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total87