*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19752
19760
19770
19780
19790
19800
19815
19820
19830
19840
19850
19860
19874
19882
19892
19900
19916
19921
199325
19943
19959
19961
19971
19980
19991
20002
20011
20025
20030
20049
20051
20063
20072
20083
20093
20101
20112
20123
20131
20141
20151
20161
20171
20181
20191
20205
20211
20221
Total116