*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
198819
19890
19906
19910
19922
19933
19943
19950
19967
19973
19986
199919
200020
200120
20022
20030
20046
20050
20061
20071
20087
20093
20103
20112
20120
20130
20148
20150
20160
20170
20183
20199
20201
20212
20224
20236
20241
Total169