*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700040117121
1970004048
197100001010
1972000077
1973001078
1974002068
19750020810
197600101314
197700301215
197800101213
197900201618
198000201618
198100001717
198201301822
198300202123
198400002121
198500001717
198610402126
198702802030
198802302126
198926901936
1990322921753
19911281021446
1992571212045
19932181612057
199406727025119
19953131112351
19964332111978
199719411127134
1998610632023167
19992512101993
200016824027120
200137220030125
200205640017113
200327642017137
200418621023131
200516134027123
200646985029187
200726874428176
2008115128827179
200919131016157
2010317213027260
201104300135340
201211892368182
201315123010139
201415351143
201511260028
2016002035
2017000101
Total6410601611279953757