from those currently anticipated and expressed in such forward-looking statements as a result of a number of factors , including those we discuss under 201crisk factors 201d and elsewhere in this form 10-k .
you should read 201crisk factors 201d and 201cforward-looking statements . 201d executive overview general american water works company , inc .
( herein referred to as 201camerican water 201d or the 201ccompany 201d ) is the largest investor-owned united states water and wastewater utility company , as measured both by operating revenues and population served .
our approximately 6400 employees provide drinking water , wastewater and other water related services to an estimated 15 million people in 47 states and in one canadian province .
our primary business involves the ownership of water and wastewater utilities that provide water and wastewater services to residential , commercial , industrial and other customers .
our regulated businesses that provide these services are generally subject to economic regulation by state regulatory agencies in the states in which they operate .
the federal government and the states also regulate environmental , health and safety and water quality matters .
our regulated businesses provide services in 16 states and serve approximately 3.2 million customers based on the number of active service connections to our water and wastewater networks .
we report the results of these businesses in our regulated businesses segment .
we also provide services that are not subject to economic regulation by state regulatory agencies .
we report the results of these businesses in our market-based operations segment .
in 2014 , we continued the execution of our strategic goals .
our commitment to growth through investment in our regulated infrastructure and expansion of our regulated customer base and our market-based operations , combined with operational excellence led to continued improvement in regulated operating efficiency , improved performance of our market-based operations , and enabled us to provide increased value to our customers and investors .
during the year , we focused on growth , addressed regulatory lag , made more efficient use of capital and improved our regulated operation and maintenance ( 201co&m 201d ) efficiency ratio .
2014 financial results for the year ended december 31 , 2014 , we continued to increase net income , while making significant capital investment in our infrastructure and implementing operational efficiency improvements to keep customer rates affordable .
highlights of our 2014 operating results compared to 2013 and 2012 include: .

2014
2013
2012
Income from continuing operations
$2.39
$2.07
$2.10
Income (loss) from discontinued operations, net of tax
$(0.04)
$(0.01)
$(0.09)
Diluted earnings per share
$2.35
$2.06
$2.01

continuing operations income from continuing operations included 4 cents per diluted share of costs resulting from the freedom industries chemical spill in west virginia in 2014 and included 14 cents per diluted share in 2013 related to a tender offer .
earnings from continuing operations , adjusted for these two items , increased 10% ( 10 % ) , or 22 cents per share , mainly due to favorable operating results from our regulated businesses segment due to higher revenues and lower operating expenses , partially offset by higher depreciation expenses .
also contributing to the overall increase in income from continuing operations was lower interest expense in 2014 compared to the same period in 2013. .

Question: Analyse this data from a financial earnings document. by how much did diluted earnings per share increase from 2012 to 2014?
Choices:
0.00169
2.16915
0.14428
0.34
0.16915
Correct choice index: 4