*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000202123
1970001012
1971000033
1972000022
1973001023
1974001023
1975011046
1976001045
19770050510
1978004059
19790020810
19800250411
19810120710
19820130711
1983002057
1984001089
19850020810
19860261615
198701160926
198804701122
198909911130
19901291111557
19911191901554
1992391911244
19930222001456
199416336015115
19954433411597
19962373501690
1997114229018190
1998212525012164
199919019013123
2000212236020180
200109922018139
200209256110159
2003025943017319
2004035543016414
2005115293018264
2006113891019249
20071136130220289
20080271120216409
2009213915204297
2010011824708373
20111124251117394
20120124183021328
201307413512212
20140949301188
201509530062
201600170017
2017002002
Total2429062085124855512