*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000407983
1970002035
1971001067
1972001056
1973001067
1974003058
1975001089
19760030811
197700301013
19780010910
197900101314
198000201113
198100001414
198200701623
198300201214
198400601824
198501201417
1986011501834
1987041712143
1988002102142
1989042801951
19902221201652
199161958120104
199265727116107
19932142113025282
19944557202023786
19953572180224781
19963538212020773
19971227208031467
1998338562028478
199937946024152
2000048091033604
2001832970035442
2002239170022485
2003139581225504
2004254658028634
20052160140043345
20062411165030608
20070409156746618
200812252582137542
2009379293139415
20101125470054650
201104726080810
20120142892159464
2013118443051513
201401520406225
201510577014106
2016012901242
2017005005
Total666215486638125712442