*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000112
1970000202
1971000101
1972000202
1973000101
1974000101
1975000404
1976000202
1977000505
1978000202
1979000606
1980000404
1981000000
1982000505
1983000202
1984000303
1985000314
1986001102
198700014317
198800019221
198900028129
199000262230
1991006131635
199200110191202
199300214613629
19940011813151334
19950041710181039
19960001211811193
199700120813834
199800111879891
199900011160171
20000031310331049
200100115925941
200200222890914
200300031951982
20040011811641183
200500139285325
200600144783828
20070026513401407
200800057526583
200900074106180
2010002206482690
2011000144270414
201200114401416
2013001115497613
2014001121448570
201500033538
201600081523
2017000033
2018000000
Total003512571634017632