*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19810
19820
19830
19840
19850
19861
19873
19882
19890
19900
19917
19923
19933
19940
19950
19960
19970
19981
19990
20001
20010
20021
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20181
20191
20203
20211
20220
20230
20240
Total35