"The dollar makes up an estimated 63 percent of central banks' global exchange reserves at present. The ratio has been falling gradually from above 70 percent in 1999, when the euro was introduced."

It is good to keep in mind that the reserves discussed are US treasuries. They are shrinking as a % of total global reserves. However the 10% decline (70% to 67%) is very misleading. Those treasuries are US government debt.
This shrinkage comes as the US has increased its debt about 40% over the same period. There are two primary destinations of US debt; one is the non-US CB's who hold these treasuries as reserves and the other is the Fed and the corrupt US banking system. The US banking cartel is buying a huge amount of its own debt (monetizing) while the rest of the world are shedding that same debt. It is the shift from the world supporting the US which has a valid, fiscally responsible characteristic, to the US buying its own debt which is a trend that has historically lead to the destruction of the currencies who’s governments choose this path. That is the trend that is most damaging to the US; both its citizens and businesses alike. It is the single most defining factor of $ value decay and indicator of the future of the US economic health.
With the historic, record setting, monstrous, wasteful, corruptible government programs coming out of dc, and the continued acceleration of the massive amounts of non-controlled derivatives and crooked bookkeeping, the US $ is accelerating this destructive trend. The $ is headed for the realm of 3rd world worthless trash and it is the citizens and entrepreneurs who will be most affected. The few who hold physical pms and quality pm stocks stand the best chance of surviving what will surely be the worst of times.