 Citing an IEG, Inc. study, $1.11 billion was spent in 2005, an estimated $1.34 billion was be spent in 2006, and the number has risen further in 2007.As an update, IEG reported that cause grew 3.9% to reach $1.85 billion in 2014.For 2015 they forecast 3.7% growth for cause to reach $1.92 billion.