MetLife has released its expected year-end earnings results … and a warning about what’s ahead in 2013. The insurer expects to end 2012 on a high note, with operating earnings of between $5.5 billion and $5.6 billion. That’s up 19 percent over 2011. But 2013 likely won’t bring the same gains. The company says that due to low interest rates, it expects 2013 operating earnings of between $5.5 billion and $5.9 billion.

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