*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19832
19841
19850
19860
19872
19881
19890
19900
19910
19923
19930
19940
19950
19961
19970
19980
19991
200010
20010
20022
20033
20040
20050
20060
20070
20083
20091
20100
20110
20120
20132
20140
20150
20160
20171
20181
20195
20200
20213
20225
20233
20249
Total59