Zarqa River Corporation, an electrical company, reported the following ratios for the years 2016 through 2019 as the following:

Financial Ratios	2016	2017	2018	2019
Profit Margin	12.3%	13.5%	15.5%	16.7%
Earnings Retention	91.9%	92.8%	92.2%	86.6%
Assets Turnover	1.14 Time	1.11 Time	1 Time	0.97 Time
Growth Rate in Sales	16.4%	21.4%	14%	8.5%
Sustainable Growth Rate	28.5%	30.5%	31.5%	26%

The Chief Executive Officer of the company is very concerned about the growth rates, so he asked you as the Financial Manager of the company to indicate if the company has a problem with the sustainable growth rates throughout the four years. If so, how the company coped with this problem.