*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19851
19867
19875
198861
19890
19904
199123
199220
199311
199410
19958
19960
19971
19985
199916
200023
200113
20027
20034
200424
20053
20069
200715
20084
20093
20101
20110
20120
20130
20140
20150
20163
20170
20180
201914
20209
20212
20223
20235
20241
Total318