Our facilities in Emerging Markets grew revenues at 22% with China and Mexico both delivering growth in excess of 30%. Although Emerging Market revenue only accounts for 8% of our revenue today, we have four new facilities in the early phase of revenue ramp up. We are well positioned to benefit from auto manufacturers' continued transition into these markets.
In the first half of the year we have invested £16m (more than 50% of overall capex) to support the growth of the business adding new capacity into existing facilities and developing new facilities. Typically it takes three to five years for revenues to fully mature in a new facility. Since 2015 we have either opened or have under development 12 facilities. These include three Specialist Technologies facilities, three Emerging Market facilities and one Specialist Technologies facility in an Emerging Market. Of the ten facilities that are already operational, we benefited from a contribution of almost 2% to the overall revenue growth in the first half of this year, with further significant future revenue growth potential.