*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970001001
1971000000
1972000000
1973000000
1974000000
1975003003
1976001001
1977001001
1978000000
1979000000
1980000000
1981000000
1982002002
1983000000
1984001001
1985000000
1986120003
1987025007
1988012003
198914150020
199011400015
1991041005
199239140098
19930224300227
19942799700808
19950566300569
19960616100617
19970249400253
19981531300535
19991221300225
200017601300774
20010614200616
200207761100787
200327191000731
20040848200850
20052173400179
200603681500383
200713323000363
200802791400293
200901243000154
201003515100402
20110834500128
20122156400162
2013121692500206
201402155800273
2015014005
20160840012
2017000000
Total309300382009712