*Excludes Observations that spanned multiple years

Pre 197024
19700
19710
19722
19731
19740
19750
19761
19771
19780
19790
19801
19810
19820
19830
19840
19851
19860
19870
19884
19892
19904
19912
19921
19932
19943
19952
199615
19971
19986
19991
20004
20014
20020
20030
20040
20050
20061
20071
20082
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
Total86