According to a survey conducted by Swiftcover.com, here's the top 10 cars which are most likely to be vandalised:

  1. Fiat 500
  2. BMW Z4
  3. Peugot 207
  4. BMW X5
  5. Range Rover
  6. Volkswagen Beetle
  7. Audi TT
  8. Fiat Punto
  9. Mini Cooper
  10. BMW 3 Series 

(Source)