*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19850
19860
19870
19880
19890
19900
19910
19926
19930
19940
19950
19960
19970
19980
19990
20004
20010
20022
20030
20042
20050
20060
20070
20082
20096
20100
20111
20120
20131
20140
20151
20160
20170
20186
20190
20200
20210
20221
20230
20240
Total35