*Excludes Observations that spanned multiple years

Pre 197022
19701
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19851
19860
19874
198836
19893
19909
199115
199227
199321
19944
19953
19962
19976
19980
19995
20001
20016
20020
20032
20040
20050
20063
20072
20084
20092
20101
20110
20120
20130
20140
20150
20160
20172
Total184