If one divides the total increase in price by the 7.5 years, the answer is 3.53 percent per annum increase.
Now then, there are some good reason to have physical gold in your possession.
From an investiing standpoint however, 3.5% is not much of a gain on an annual basis..
So the only other reason to buy it is for whathappens when paper money becomes only good to start a fire in the fireplace...
Its a tough decision but remember just as precious metals can go up at various times, they also can come back down..
Just some food for thought..