The Silicon Valleys output is comparable to a major country such as the New Zealand 1307 billion in 2008 but not quite so great as that of Singapore 1819 billion in 2008

What is the correctly punctuated version of this sentence?
The Silicon Valley's output is comparable to a major country, such as the New Zealand ($130.7 billion in 2008), but not quite so great as that of Singapore ($181.9 billion in 2008).