. the increase of $ 16.2 million in net cash used in investing activities in 2003 was primarily due to the following : 2022 the maturity in 2002 of $ 22.4 million of other temporary investments that had been made in 2001 , which provided cash in 2002 ; 2022 an increase in decommissioning trust contributions and realized change in trust assets of $ 8.2 million in 2003 compared to 2002 ; and 2022 other temporary investments of $ 6.5 million made in 2003