XL GROUP PLC | 2013 | FY | 3

Future minimum rental commitments under existing operating leases are expected to be as follows:
Year Ended December 31,
(U.S. dollars in thousands)
 
2014
$
37,095

2015
34,554

2016
28,410

2017
23,623

2018
19,133

2019-2031
83,190

Total minimum future rentals
$
226,005

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The future minimum lease payments in the aggregate are expected to be $215.5 million and annually for the next five years are as follows:
Year Ended December 31,
(U.S. dollars in thousands)
 
2014
$
12,515

2015
12,828

2016
13,149

2017
13,477

2018
13,815

2019-2028
149,686

Total minimum future lease payments
$
215,470

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During the three years ended December 31, 2013, 2012 and 2011, P&C gross written premiums generated from or placed by the below companies individually accounted for more than 10% of the Company’s consolidated gross written premiums from P&C operations, as follows:
(Percentage of consolidated gross written premiums from P&C operations)
2013
 
2012
 
2011
AON Corporation and subsidiaries
21
%
 
22
%
 
20
%
Marsh & McLennan Companies
23
%
 
21
%
 
20
%
Willis Group and subsidiaries
13
%
 
11
%
 
12
%

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A summary of the Company's outstanding financial guarantee exposures for the years indicated is as follows:
Financial Guarantee Exposure Summary
(U.S. dollars in thousands except number of contracts and term to maturity)
2013
 
2012
Opening number of financial guarantee contracts
4

 
4

Number of financial guarantee contracts matured, prepaid or commuted during the period
(1
)
 
—

Closing number of financial guarantee contracts
3

 
4

Principal outstanding
$
108,255

 
$
115,464

Interest outstanding
$
—

 
$
—

Aggregate exposure outstanding
$
108,255

 
$
115,464

Total gross claim liability recorded
$
—

 
$
1,399

Total unearned premiums and fees recorded
$
134

 
$
279

Weighted average contractual term to maturity in years
26.0

 
25.4

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