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Table 1 Number and rate* (95% confidence interval) of twins in Canada (excluding Ontario) and the United States, 1991-2009

From: Temporal trends in the frequency of twins and higher-order multiple births in Canada and the United States

Year Canada (excluding Ontario) United States
  Number of live births Twin live births Number of live births Twin live births
   Number Rate (95% CI)   Number Rate (95% CI)
1991 250847 5027 20.0 (19.5-20.6) 4110907 94779 23.1 (22.9-23.2)
1992 247898 5053 20.4 (19.8-20.9) 4065014 95372 23.5 (23.3-23.6)
1993 240468 4920 20.5 (19.9-21.0) 4000240 96445 24.1 (24.0-24.3)
1994 238069 5013 21.1 (20.5-21.6) 3952767 97064 24.6 (24.4-24.7)
1995 231813 5005 21.6 (21.0-22.2) 3899589 96736 24.8 (24.7-25.0)
1996 226180 5008 22.1 (21.5-22.8) 3891494 100750 25.9 (25.7-26.0)
1997 215588 4975 23.1 (22.4-23.7) 3880894 104137 26.8 (26.7-27.0)
1998 209795 5133 24.5 (23.8-25.1) 3941553 110670 28.1 (27.9-28.2)
1999 206169 5140 24.9 (24.3-25.6) 3959417 114307 28.9 (28.7-29.0)
2000 200476 5117 25.5 (24.8-26.2) 4058814 118916 29.3 (29.1-29.5)
2001 202036 5337 26.4 (25.7-27.1) 4025933 121246 30.1 (29.9-30.3)
2002 200287 5324 26.6 (25.9-27.3) 4021726 125134 31.1 (30.9-31.3)
2003 204279 5753 28.2 (27.4-28.9) 4089950 128665 31.5 (31.3-31.6)
2004 204521 5798 28.3 (27.6-29.1) 4112052 132219 32.2 (32.0-32.3)
2005 208416 5869 28.2 (27.5-28.9) 4138349 133122 32.2 (32.0-32.3)
2006 219202 6665 30.4 (29.7-31.1) 4265555 137085 32.1 (32.0-32.3)
2007 229428 6770 29.5 (28.8-30.2) 4316233 138961 32.2 (32.0-32.4)
2008 237342 6953 29.3 (28.6-30.0) 4247694 138660 32.6 (32.5-32.8)
2009 240823 7564 31.4 (30.7-32.1) 4130665 137217 33.2 (33.0-33.4)
  1. * Rates expressed per 1,000 live births.