*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19832
19841
19850
19861
19870
19880
19890
19900
19910
19920
19930
19940
19951
19960
19973
19984
19997
20000
20010
2002116
2003116
2004232
20050
20063
200758
200858
200958
20100
20110
20124
201358
20140
20150
20160
20170
Total722