US Sales Volume
| 1970 | 16,215 |
| 1971 | 33,684 |
| 1972 | 52,628 |
| 1973 | 45,588 |
| 1974 | 40,172 |
| 1974 2+2 | 9,499 |
| 1975 | 40,216 |
| 1975 2+2 | 11,594 |
| 1976 | 45,766 |
| 1976 2+2 | 13,792 |
| 1977 | 54,594 |
| 1978 | 62,699 |
| 1979 | 86,007 |
| 1980 | 71,533 |
| 1981 | 62,799 |
| 1982 | 57,260 |
| 1983 | 71,144 |
| 1984 | 73,101 |
| 1985 | 67,409 |
| 1986 | 52,936 |
| 1987 | 33,566 |
| 1988 | 19,357 |
| 1989 | 26,387 |
| 1990 | 22,095 |
| 1991 | 14,903 |
| 1992 | 9,695 |
| 1993 | 9,168 |
| 1994 | 6,246 |
| 1995 | 4,176 |
| 1996 | 2,074 |
| 1997 | 1,010 |
| 1998 | 124 |
| 1999 | 15 |
| 2000 | 3 |
| 2001 | 3 |
| 2002 | 13,250 |
| 2003 | 36,728 |
| 2004 | 30,690 |
| 2005 | 27,278 |
| 2006 | 24,635 |
| 2007 | 18,957 |
| 2008 | 10,337 |
| 2009 | 13,117 |
| 2010 | 10,215 |
| 2011 | 7,328 |
| 2012 | 7,338 |
| 2013 | 6,561 |
| 2014 | 7,119 |
| 2015 | 7,391 |
| 2016 | 5,913 |
| 2017 | 4,614 |
| 2018 | 3,468 |
| 2019 | 2,834 |
| 2020 | 1,954 |
| 2021 | 34 |