The numbers tell the story as the world transitions from dependence on fossil fuels.
In 2004, the amount of new global investment in renewable energy was $40 billion which translated to a 3.7 gigawatts total in world production capacity of solar power.
In 2013, the amount of new global investment in renewable energy was $214 billion which translated to a 139 gigawatts total in world production capacity of solar power.
Source:
Yes! magazine, Spring 2015
Renewable Energy Policy Network for the 21st Century, Global Status Report 2014