*Excludes Observations that spanned multiple years

Pre 197010
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19892
19903
19910
19921
19933
19940
19951
19960
19970
19980
19991
20000
20010
20021
20033
20041
20050
20060
20070
20082
20094
20101
20110
20120
20131
20143
20153
20160
20170
20181
20190
20203
20212
20222
20233
20242
Total55