*Excludes Observations that spanned multiple years

Pre 197012
19700
19710
19720
19730
19740
19750
19760
19772
19782
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19911
19920
19930
19940
19954
19961
19970
19987
19991
20000
20010
20020
20034
20040
20050
20060
20070
20080
20090
20100
20110
20120
20131
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total36