*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19881
19891
19901
19911
19924
19936
199416
19955
199615
19977
19985
19990
20001
20011
20024
20031
20041
20050
20061
20075
200810
20093
20101
20112
20123
20135
20143
20151
20162
20170
20182
20190
20200
20210
20220
Total109