*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19811
19820
19830
19840
19850
19865
19870
19880
198910
19905
19910
19921
199316
19947
199515
19961
19970
19980
19990
20002
20018
20021
20030
20040
200517
20061
20071
20081
20091
20102
20110
20120
20131
20140
20150
20160
20170
20181
20191
20200
20210
20220
Total99