*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19881
19890
19902
19914
19921
199314
19940
19951
19963
19971
19981
19991
20001
20010
20021
20031
20041
20050
20060
20073
20083
20093
20102
20111
20120
20131
20140
20150
20160
20170
20180
20191
20201
20210
20220
Total49