Google cloud revenue remained a mystery in parent company Alphabet’s first quarter 2019 earnings, which saw a revenue miss and the tech giant’s slowest growth since 2015. After posting its quarterly earnings on Monday afternoon, Alphabet shares fell 7 percent in after-hour trading and dropped another percentage point by Tuesday afternoon.

The company reported disappointing sales growth across all of its categories, and a $1.7 billion fine from the European Union for its online advertising practices also hurt earnings.

Alphabet reported Q1 earnings of $6.66 billion, or $9.50 a share, on revenue of $29.48 billion. Its earnings would have been $11.90 a share if not for the European fine.

Meanwhile operating expenses reached $13.7 billion including the impact from the E.U. fine, and $12 billion without it, which still represented a 20% year-over-year increase.

Alphabet CFO Ruth Porat said the biggest increase in research and development expenses came from headcount growth, primarily from Google Cloud — and, indeed, hiring more sales and support staff has been a top priority for new Google Cloud CEO Thomas Kurian.

But while both Porat and Google CEO Sundar Pichai insisted on the call with investors that Google Cloud remains a fast growing business that’s driving Alphabet revenue growth, they still won’t put an exact number on the cloud business. Instead, cloud gets lumped into “other revenues,” which grew 25% year over year to $5.4 billion.

One investor on the call, referring to Amazon and Microsoft, specifically asked about the company’s cloud business: “when do you think you are going to be in a position to share revenue figures or even growth rates similar to what the others have been sharing for quite some time?”

And while unlike Amazon, Microsoft doesn’t disclose exact revenue for its Azure public cloud, Microsoft did say last week that its commercial cloud revenue grew 41% year over year to $9.65 billion for its third fiscal quarter.

Still, Pichai dodged the question: “We are definitely seeing a strong momentum, and look forward to being able to share more at the appropriate time.”