Generate a correctly punctuated version of the following text: In the calculation it is estimated that 5 per cent of all shoes with plastic rubber or leather soles contain polyether In 1998 approx 128 million pairs of shoes were imported Statistics Denmark Foreign Trade and it is estimated that a single pair of shoes contains an average of 8 g HFC134a
In the calculation, it is estimated that 5 per cent of all shoes with plastic, rubber, or leather soles contain polyether. In 1998 approx. 12.8 million pairs of shoes were imported (Statistics Denmark, Foreign Trade) and it is estimated that a single pair of shoes contains an average of 8 g HFC-134a.