The weather could play a big role for the green jersey battle on this stage by the way.
Anyhow:
2002: 189 starters, 5 withdrawals due to crashes, 2.65% attrition
2003: 198 starters, 6 withdrawals due to crashes, 3.03% attrition
2004: 188 starters, 10 withdrawals due to crashes, 5.32% attrition
2005: 189 starters, 8 withdrawals due to crashes, 4.23% attrition
2006: 176 starters, 4 withdrawals due to crashes, 2.27% attrition
2007: 189 starters, 9 withdrawals due to crashes, 4.76% attrition
2008: 180 starters, 4 withdrawals due to crashes, 2.22% attrition
2009: 180 starters, 5 withdrawals due to crashes, 2.78% attrition
2010: 197 starters, 9 withdrawals due to crashes, 4.57% attrition
2011: 198 starters, 16 withdrawals due to crashes, 8.08% attrition