sysco corporation a0- a0form a010-k 3 part a0i item a01 a0business we estimate that our sales by type of customer during the past three fiscal years were as follows: .

2019: restaurants: -62
education government: 9
travel leisure retail: 9
healthcare: 8
other ( 1 ): 12
totals: -100
2018: restaurants: -62
education government: 8
travel leisure retail: 8
healthcare: 9
other ( 1 ): 13
totals: -100
2017: restaurants: -61
education government: 9
travel leisure retail: 9
healthcare: 9
other ( 1 ): 12
totals: -100

( 1 ) other includes cafeterias that are not stand-alone restaurants , bakeries , caterers , churches , civic and fraternal organizations , vending distributors , other distributors and international exports . none of these types of customers , as a group , exceeded 5% ( 5 % ) of total sales in any of the years for which information is presented . sources of supply we purchase from thousands of suppliers , both domestic and international , none of which individually accounts for more than 10% ( 10 % ) of our purchases . these suppliers consist generally of large corporations selling brand name and private label merchandise , as well as independent regional brand and private label processors and packers . we also provide specialty and seasonal products from small to mid-sized producers to meet a growing demand for locally sourced products . our locally sourced products , including produce , meats , cheese and other products , help differentiate our customers 2019 offerings , satisfy demands for new products , and support local communities . purchasing is generally carried out through both centrally developed purchasing programs , domestically and internationally , and direct purchasing programs established by our various operating companies . we administer a consolidated product procurement program designed to develop , obtain and ensure consistent quality food and non-food products . the program covers the purchasing and marketing of branded merchandise , as well as products from a number of national brand suppliers , encompassing substantially all product lines . some of our products are purchased internationally within global procurement centers in order to build strategic relationships with international suppliers and to optimize our supply chain network . sysco 2019s operating companies purchase product from the suppliers participating in these consolidated programs and from other suppliers , although sysco brand products are only available to the operating companies through these consolidated programs . we also focus on increasing profitability by lowering operating costs and by lowering aggregate inventory levels , which reduces future facility expansion needs at our broadline operating companies , while providing greater value to our suppliers and customers . working capital practices our growth is funded through a combination of cash flow from operations , commercial paper issuances and long-term borrowings . see the discussion in item 7 201cmanagement 2019s discussion and analysis of financial condition and results of operations - liquidity and capital resources 201d regarding our liquidity , financial position and sources and uses of funds . we extend credit terms to our customers that can vary from cash on delivery to 30 days or more based on our assessment of each customer 2019s credit worthiness . we monitor each customer 2019s account and will suspend shipments if necessary . a majority of our sales orders are filled within 24 hours of when customer orders are placed . we generally maintain inventory on hand to be able to meet customer demand . the level of inventory on hand will vary by product depending on shelf-life , supplier order fulfillment lead times and customer demand . we also make purchases of additional volumes of certain products based on supply or pricing opportunities . we take advantage of suppliers 2019 cash discounts where appropriate and otherwise generally receive payment terms from our suppliers ranging from weekly to 45 days or more . corporate headquarters and shared services center our corporate staff makes available a number of services to our operating companies and our shared services center performs support services for employees , suppliers and customers . members of these groups possess experience and expertise in , among other areas , customer and vendor contract administration , accounting and finance , treasury , legal , information technology , payroll and employee benefits , risk management and insurance , sales and marketing , merchandising , inbound logistics , human resources , strategy and tax compliance services . the corporate office also makes available supply chain expertise , such as in warehousing and distribution services , which provide assistance in operational best practices , including space utilization , energy conservation , fleet management and work flow. .

Questions:
what was the percentage of sales to restaurants in 2018?
what was it in the previous year, 2017?
by what amount, then, did that percentage increase over the year?
and what was this increase amount in that percentage over the next year, from 2018 to 2019?

Answers:
62%
61%
1%
0%