There have been reductions, but most of the reductions have happened for reasons other than policy, so whether there have big reductions below business as usual is at issue. For example, Britain has made substantial strides in reducing emissions, and those had very little to do with policy and were not plentiful. They had to do with Mrs. Thatcher's desire to confront the coal unions, the collapse of coal mining and coal-fired electricity, and the replacement of coal by cheap gas from the North Sea. That had a big impact.
Similarly, the collapse in the former East Germany has had a very big effect, but in terms of actual reduction of emissions below baseline from climate policy, results have been...not zero, but not very much yet.