operating expenses operating expenses were $ 2.9 billion , an increase of 8% ( 8 % ) over 2000 . adjusted for the formation of citistreet , operating expenses grew 10% ( 10 % ) . expense growth in 2001 of 10% ( 10 % ) is significantly lower than the comparable 20% ( 20 % ) expense growth for 2000 compared to 1999 . state street successfully reduced the growth rate of expenses as revenue growth slowed during the latter half of 2000 and early 2001 . the expense growth in 2001 reflects higher expenses for salaries and employee benefits , as well as information systems and communications . o p e r a t i n g e x p e n s e s ( dollars in millions ) 2001 2000 1999 change adjusted change 00-01 ( 1 ) .

2001: salaries and employee benefits: 1663
information systems and communications: 365
transaction processing services: 247
occupancy: 229
other: 363
total operating expenses: 2867
number of employees: 19753
2000: salaries and employee benefits: 1524
information systems and communications: 305
transaction processing services: 268
occupancy: 201
other: 346
total operating expenses: 2644
number of employees: 17604
1999: salaries and employee benefits: 1313
information systems and communications: 287
transaction processing services: 237
occupancy: 188
other: 311
total operating expenses: 2336
number of employees: 17213
change 00-01: salaries and employee benefits: -9
information systems and communications: 20
transaction processing services: -8
occupancy: 15
other: 5
total operating expenses: 8
number of employees: 12
adjusted change 00-01 ( 1 ): salaries and employee benefits: -11
information systems and communications: 22
transaction processing services: -7
occupancy: 16
other: 7
total operating expenses: 10

( 1 ) 2000 results adjusted for the formation of citistreet expenses related to salaries and employee benefits increased $ 139million in 2001 , or $ 163millionwhen adjusted for the formation of citistreet . the adjusted increase reflects more than 2100 additional staff to support the large client wins and new business from existing clients and acquisitions . this expense increase was partially offset by lower incentive-based compensation . information systems and communications expense was $ 365 million in 2001 , up 20% ( 20 % ) from the prior year . adjusted for the formation of citistreet , information systems and communications expense increased 22% ( 22 % ) . this growth reflects both continuing investment in software and hardware , aswell as the technology costs associated with increased staffing levels . expenses related to transaction processing services were $ 247 million , down $ 21 million , or 8% ( 8 % ) . these expenses are volume related and include external contract services , subcustodian fees , brokerage services and fees related to securities settlement . lower mutual fund shareholder activities , and lower subcustodian fees resulting from both the decline in asset values and lower transaction volumes , drove the decline . occupancy expensewas $ 229million , up 15% ( 15 % ) . the increase is due to expenses necessary to support state street 2019s global growth , and expenses incurred for leasehold improvements and other operational costs . other expenses were $ 363 million , up $ 17 million , or 5% ( 5 % ) . these expenses include professional services , advertising and sales promotion , and internal operational expenses . the increase over prior year is due to a $ 21 million increase in the amortization of goodwill , primarily from acquisitions in 2001 . in accordance with recent accounting pronouncements , goodwill amortization expense will be eliminated in 2002 . state street recorded approximately $ 38 million , or $ .08 per share after tax , of goodwill amortization expense in 2001 . state street 2019s cost containment efforts , which reduced discretionary spending , partially offset the increase in other expenses . state street corporation 9 .

Questions:
what is the change in the number of employees between 1999 and 2000?
what is the percent change?

Answers:
391
2.3%