The value of silver has risen by 159pc since the start of the year - Wei Leng Tay/Bloomberg Silver is on track for its best year since 1979 as a Chinese crackdown on exports helps fuel a huge price rally. The precious metal jumped by 6.29pc on Friday to hit an all-time high of $76.37 (£56.59) per ounce. Silver has now risen by 159pc since the start of the year, more than double the 70pc rise in gold prices recorded so far this year. Precious metals are considered a safe-haven asset and investors have ...