*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970011002
1971001001
1972000000
1973001001
1974000000
1975000000
1976001001
1977002002
1978001001
1979000000
1980001001
1981001001
1982000000
1983000011
1984000000
1985000000
1986002002
1987026008
19880760013
1989052007
199002650031
199112150027
199232470034
199336270072
199431011400118
199548270093
199627700180
1997375150093
199827350080
199913860045
20002109500116
2001173120086
20020861700103
200331242200149
200431851200200
20051922600119
200651363900180
200721846700253
200811525700210
20092456300110
201046910600179
20110428600128
2012065300095
20130743400108
20140942500119
2015110150026
2016013004
2017001001
Total472135717022901