What is the number of "to par" in Mexico with a winning score of 67-67-69-70=273?
{'header': ['Year', 'Dates', 'Champion', 'Country', 'Winning score', 'To par', 'Margin of victory', 'Purse ( $ )', 'Winners share ($)'], 'page_title': 'Navistar LPGA Classic', 'section_title': 'Winners', 'caption': 'Winners', 'rows': [['2012', 'Sep 20–23', 'Stacy Lewis', 'United States', '66-70-65-69=270', '–18', '2 strokes', '1300000', '195000'], ['2011', 'Sep 15–18', 'Lexi Thompson 1', 'United States', '66-68-67-70=271', '–17', '5 strokes', '1300000', '195000'], ['2010', 'Oct 7–10', 'Katherine Hull', 'Australia', '68-67-67-67=269', '–19', '1 stroke', '1300000', '195000'], ['2009', 'Oct 1–4', 'Lorena Ochoa (2)', 'Mexico', '66-68-66-70=270', '–18', '4 strokes', '1400000', '210000'], ['2008', 'Sep 25–28', 'Lorena Ochoa', 'Mexico', '67-67-69-70=273', '–15', 'Playoff 2', '1400000', '210000']]}