*Excludes Observations that spanned multiple years

Pre 197025
19701
19710
19720
19730
19742
19750
19760
19771
19781
19791
19800
19810
19820
19830
19840
19850
19860
19871
19881
19890
19901
19912
19921
19930
19946
19950
19960
19971
19981
19991
20001
20010
20021
2003140
20047
2005217
200619
20075
20084
200936
20100
20110
20126
20130
20141
20150
20161
20172
20180
Total486