Nevertheless, increased longevity and falling birth rates are major factors making many state pension systems across Europe unsustainable in their present form. Some member states have already introduced major reforms (e.g. Germany, France and Austria) others have continued to adapt their existing systems.
Germany, France and Austria are experiencing falling birth rates. 
The text does not state which specific countries are experiencing falling birth rates.
( z1 experience :ARG0 ( z2 and :op ( z3 country :name ( z4 name :op "Germany" ) ) :op ( z5 country :name ( z6 name :op "France" ) ) :op ( z7 country :name ( z8 name :op "Austria" ) ) ) :ARG1 ( z9 rate :mod ( z10 bear ) :ARG1-of ( z11 fall ) ) )