Taiwan's Marriages - What percent non Taiwanese?

Taiwan Foreign Spouses2003 - 28%
2008 - 13%
2009 - 13%

And this does not count Chinese citizens.

1 in 10 children are born to immigrant parents.

I am not understanding what is going on with marriages in Taiwan, but there is a larger story here. The more I read on it, the more confused I am.

References:

International marriage, Herr and Madame, Señor and Mrs - The Economist
The Low Marriage Rate in Taiwan: Part II - laorencha blog
Taiwan Women's Marriage Rate Hits All-Time Low - All-China Women's Federation
Taiwan’s birth, marriage rates hit new high in 2011 - Taiwan Today
Changing Taiwan faces new challenges - BBC