Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. | Date | Tournament | Winning score | Margin of\nvictory | Runner(s)-up |
| --- | --- | --- | --- | --- | --- |
| 1 | Feb 26, 1978 | Bent Tree Classic | +1 (71-72-73-73=289) | 1 stroke | Jo Ann Washam |
| 2 | Mar 12, 1978 | Sunstar Classic | −3 (72-72-70-71=285) | 1 stroke | Debbie Austin, Debbie Massey |
| 3 | May 14, 1978 | Greater Baltimore Classic | −7 (67-73-72=212) | 3 strokes | Donna Caponi |
| 4 | May 21, 1978 | Coca-Cola Classic | −3 (69-71-70=210) | Playoff | JoAnne Carner |
| 5 | May 29, 1978 | Golden Lights Championship | −11 (67-72-73-65=277) | 1 stroke | Jane Blalock |
| 6 | Jun 11, 1978 | LPGA Championship | −13 (71-65-69-70=275) | 6 strokes | Amy Alcott |
| 7 | Jun 18, 1978 | Bankers Trust Classic | −5 (72-73-69=214) | 2 strokes | Jane Blalock, Debbie Massey |
| 8 | Aug 6, 1978 | Colgate European Open | −7 (73-71-72-73=289) | 3 strokes | JoAnne Carner, Mary Dwyer,\n Sally Little |
| 9 | Nov 12, 1978 | Colgate Far East Open | E (75-69-72=216) | 2 strokes | Silvia Bertolaccini, Kathy Whitworth |
| 10 | Mar 11, 1979 | Sunstar Classic | −8 (70-71-70-69=280) | 1 stroke | Hollis Stacy |
| 11 | Mar 25, 1979 | Sahara National Pro-Am | −16 (72-67-66-69=274) | 2 strokes | Donna Caponi |
| 12 | May 6, 1979 | Women's International | −6 (72-71-71-68=282) | 3 strokes | Donna White |
| 13 | May 20, 1979 | Coca-Cola Classic | −3 (73-70-73=216) | Playoff | Bonnie Bryant, Hollis Stacy,\n Jo Ann Washam, Mickey Wright |
| 14 | Jun 3, 1979 | Golden Lights Championship | −8 (67-70-73-70=280) | 4 strokes | Pat Bradley |
| 15 | Jun 24, 1979 | Lady Keystone Open | −4 (72-68-72=212) | 2 strokes | Sally Little, Kathy Whitworth |
| 16 | Aug 5, 1979 | Colgate European Open | −6 (68-69-70-75=282) | 4 strokes | Joyce Kazmierski |
| 17 | Sep 30, 1979 | Mary Kay Classic | −14 (71-66-67-70=274) | 2 strokes | Sandra Post |
| 18 | Mar 30, 1980 | Women's Kemper Open | E (72-66-77-69=284) | 2 strokes | Debbie Massey, Jo Ann Washam |
| 19 | Jun 29, 1980 | The Sarah Coventry | −9 (73-67-72-71=283) | 1 stroke | Pat Bradley |
| 20 | Sep 1, 1980 | Rail Charity Golf Classic | −13 (65-71-71-68=275) | 1 stroke | JoAnne Carner |
| 21 | Mar 8, 1981 | Arizona Copper Classic | −14 (70-72-68-68=278) | 4 strokes | Pat Bradley |
| 22 | Apr 5, 1981 | Colgate-Dinah Shore | −11 (71-73-69-64=277) | 2 strokes | Carolyn Hill |
| 23 | Jun 28, 1981 | The Sarah Coventry | −3 (74-69-71-71=285) | 2 strokes | Pat Bradley |
| 24 | Mar 21, 1982 | J&B Scotch Pro-Am | −5 (70-67-69-73=279) | 5 strokes | Sandra Haynie |
| 25 | Nov 7, 1982 | Mazda Japan Classic | −9 (66-70-71=207) | 6 strokes | Amy Alcott |
| 26 | Feb 6, 1983 | Elizabeth Arden Classic | −3 (71-71-70-73=285) | 1 stroke | Pat Bradley, JoAnne Carner,\n Stephanie Farwig, Betsy King |
| 27 | Apr 10, 1983 | J&B Scotch Pro-Am | −6 (71-69-69-74=283) | 1 stroke | Laura Baugh |
| 28 | Mar 4, 1984 | Uniden LPGA Invitational | E (70-74-66-74=284) | 3 strokes | Pat Bradley |
| 29 | Aug 19, 1984 | Chevrolet World Championship of Women's Golf | −7 (69-74-65-73=281) | 1 stroke | JoAnne Carner |
| 30 | May 19, 1985 | Chrysler-Plymouth Classic | −9 (69-69-72=210) | 3 strokes | Pat Bradley |
| 31 | Jun 7, 1985 | LPGA Championship | −15 (65-71-72-65=273) | 8 strokes | Alice Miller |
| 32 | Jul 7, 1985 | Mazda Hall of Fame Championship | −7 (71-70-72-68=281) | 3 strokes | JoAnne Carner, Allison Finney |
| 33 | Aug 11, 1985 | Henredon Classic | −20 (66-67-69-66=268) | 10 strokes | Val Skinner |
| 34 | Sep 8, 1985 | Portland Ping Championship | −1 (69-76-70=215) | Playoff | Lori Garbacz |
| 35 | Feb 8, 1987 | Sarasota Classic | −7 (73-66-68-74=281) | 3 strokes | Kathy Guadagnino, Anne Marie Palli |
| 36 | Sep 13, 1987 | Cellular One-Ping Golf Championship | −6 (72-67-71=210) | 1 stroke | Kelly Leadbetter, Muffin Spencer-Devlin,\n Jan Stephenson |
| 37 | Feb 7, 1988 | Mazda Classic | −5 (69-68-71-75=283) | 2 strokes | Marta Figueras-Dotti |
| 38 | Apr 17, 1988 | AI Star/Centinela Hospital Classic | −6 (71-72-67=210) | Playoff | Marta Figueras-Dotti |
| 39 | May 15, 1988 | Chrysler-Plymouth Classic | −12 (68-70-66=204) | 8 strokes | Jan Stephenson |
| 40 | May 21, 1989 | Mazda LPGA Championship | −14 (71-69-68-66=274) | 3 strokes | Ayako Okamoto |
| 41 | Jul 30, 1989 | Atlantic City Classic | −10 (67-70-69=206) | 1 stroke | Christa Johnson, Vicki Fergon |
| 42 | Sep 24, 1989 | Nippon Travel-MBS Classic | −11 (73-69-65-70=277) | 2 strokes | Alice Ritzman, Pamela Wright |
| 43 | Sep 23, 1990 | MBS LPGA Classic | −7 (69-70-74-68=281) | Playoff | Cathy Gerring |
| 44 | May 5, 1991 | Sara Lee Classic | −10 (65-70-71=206) | 2 strokes | Kris Monaghan |
| 45 | Sep 7, 1992 | Rail Charity Golf Classic | −17 (67-68-64=199) | Playoff | Laura Davies |
| 46 | Sep 13, 1992 | Ping-Cellular One LPGA Golf Championship | −7 (70-70-69=209) | Playoff | Jane Crafter |
| 47 | Jul 11, 1993 | Youngstown-Warren LPGA Classic | −13 (68-68-67=203) | Playoff | Deb Richard |
| 48 | Apr 27, 1997 | Chick-fil-A Charity Championship | −7 (71-66=137) | 2 strokes | Tina Barrett, Deb Richard,\n Karrie Webb |
Question:
how many tour wins did nancy lopez have before 1980?
Answer:
17