*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19830
19840
19850
19860
19870
19882
19890
199011
19917
19921
19932
19944
199514
19961
19973
19980
19992
20001
20018
20020
20036
20041
20050
20060
20070
20082
20092
201010
20110
20120
201314
20145
20156
20164
20170
20183
20191
20202
202110
20223
20230
20241
Total129