*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19883
19890
19907
19917
199210
199312
19949
199511
19960
19970
19980
19993
200010
200117
20022
20031
20040
20051
20060
20070
20081
20091
20101
20110
20121
20132
20140
20151
20161
20171
20180
20191
20200
20210
20220
Total103