The number of registered voters between the ages of 18 and 35 has jumped more than 12 per cent from last year – the surge resulting from hundreds of thousands of young Hongkongers signing up to vote amid the extradition bill crisis.Nearly 386,000 people have registered to vote in the past year – the most since at least 2003 – bringing the number of voters in the city to 4.12 million, according to figures released on Thursday by the Registration and Electoral Office.The publication of the 2019…