*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000505459
1970001012
1971001056
1972001056
1973001078
1974000000
1975000022
1976000033
197700101112
1978000022
1979000066
1980001067
1981000066
1982001067
1983012036
198400001414
1985001078
19860040913
19870220913
19880240511
198901201114
1990011169
19911281214
199208130728
19930830718
1994059401578
199502871743
199604330753
199701680731
199804441756
19990420612
2000016501334
2001014501130
2002038150962
200301360423
2004075701092
2005119701037
2006035701052
200702850841
2008018120939
20090190616
2010033210458
201109251742
20120211401651
2013012230035
2014014130027
2015013048
2016000000
2017001001
Total256625853641195