why there is an decrease in 2011 and 2012 in working capital?

and why there is an increase in working capital from 2014 to 2016?

and why in 2013 there is no inpact on the cash flows?

Working Capital Requirements for NPV al Requirements 2010 2011 2012 2013 2014 2015 2016 Incremental cash: Incremental A/R: $0 3.30% $0 600 days $0 520 days $0 Incremental Inventory: ($713) 3.30% (53,551) 600 days ($2.431) 520 day (586) 0.40% $842 30 days $158 0.73% $134 Prepaid expenses: ($211) 3.30% ($1.052) 300 days (5720) 520 (526) 0:40 $249 300 $47 0.734 $40 0.625 $198 3.30 $986 50 0 days $675 520 days $24 $561 3.304 $2,795 600 days $1,913 52 days 558 0.40 ($662) 300 days ($124) 01733 ($105) 0.02 $165 330 $822 30 days 5563 52 days $20 0409 ($195) 300 days ($37) 0.73% (531) Accounts payable: 0409 $0 Accrued expenses: 300 $0 0.7946 SO 0.824 040 ($234) 300 days (544) 0.7390 ($37) 0.5296 Other current liabilities 0.62 0.02 Total Change in NWC: ($5.648) ($1,673) so $4,445 $1.569 $2,307 Working Capital Requirements for NPV al Requirements 2010 2011 2012 2013 2014 2015 2016 Incremental cash: Incremental A/R: $0 3.30% $0 600 days $0 520 days $0 Incremental Inventory: ($713) 3.30% (53,551) 600 days ($2.431) 520 day (586) 0.40% $842 30 days $158 0.73% $134 Prepaid expenses: ($211) 3.30% ($1.052) 300 days (5720) 520 (526) 0:40 $249 300 $47 0.734 $40 0.625 $198 3.30 $986 50 0 days $675 520 days $24 $561 3.304 $2,795 600 days $1,913 52 days 558 0.40 ($662) 300 days ($124) 01733 ($105) 0.02 $165 330 $822 30 days 5563 52 days $20 0409 ($195) 300 days ($37) 0.73% (531) Accounts payable: 0409 $0 Accrued expenses: 300 $0 0.7946 SO 0.824 040 ($234) 300 days (544) 0.7390 ($37) 0.5296 Other current liabilities 0.62 0.02 Total Change in NWC: ($5.648) ($1,673) so $4,445 $1.569 $2,307