求翻译：人民币对美元汇率自1986年至1994年呈上升趋势，1994至2005年基本保持在一个比较稳定的水平上，但自2005年汇改以来，人民币兑美元汇率呈逐步下降趋势。是什么意思？

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yuan-dollar exchange rate from 1986 to 1994, and has been on an upward trend in 1994 and 2005 remained in a relatively stable level, but since 2005, and the Renminbi exchange rate has been replaced by a steady decline in dollar trend.

The Renminbi assumed the trend of escalation to US dollar exchange rate from 1986 to 1994, maintained basically 1994 to 2005 in a quite stable level, but has collected since 2005 changes, the Renminbi exchanges US dollar exchange rate to assume drops the tendency gradually.

Renminbi exchange rate against the dollar since 1986 to 1994 on the rise, remained at a relatively stable level of 1994-2005, but since the 2005 reform, the Yuan exchange rate against the dollar on a gradually declining trend.

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