This question involves questions about an excerpt of an article and a related graph.

The following graph depicts the iPhone's importance to Apple's revenues over the last 10 years.Use it to answer the related questions.

The iphone's Importance to Apple iPhone revenue as a percentage of Apple's total revenue since 2007* 80% 69% 70% 60% 50% 40% WV 55% 30% 20% 10% '07 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 cc * Fiscal quarters; Apple's fiscal year ends in September @StatistaCharts Source: Apple statista