The statistics show that the 2% comes from breakage/slippage, micropores and manufacturing defects: https://www.contraceptionjournal.org/article/S0010-7824(04)

The statistics show that the 2% comes from breakage/slippage, micropores and manufacturing defects: https://www.contraceptionjournal.org/article/S0010-7824(04)00157-X/abstract https://www.contraceptionjournal.org/article/S0010-7824(04)0...