*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000055
1970000011
1971000000
1972000000
1973000000
1974000011
1975001012
1976000000
1977000044
1978000033
1979000022
1980100012
1981000033
1982001056
1983001045
1984000055
1985002046
1986001012
19870341412
19880380415
1989003159
19900400610
19910540110
19920710311
199301010112
199412561405276
199512371306257
199602051303221
199721003406142
19980314102317
199902510632
200023256010343
2001097507109
20020218807233
200304130549
20041186504196
2005088507100
2006197308109
20072125909145
2008053120469
200900100010
2010024240048
2011018140032
201206830172
201308550090
201405220054
20150360110
2016030003
2017000000
Total11265222321553043